Essential Linux skills for cybersecurity. Each module combines a short explanation, real commands, a hands-on lab you run in your own virtual machine, and a self-check quiz.
Set up an isolated lab: a Linux virtual machine such as Ubuntu Server or Debian. Only test systems you own or have explicit written permission to assess.
Find your way around the Linux directory tree and read, set and audit file permissions — the foundation of Linux security.
How Linux stores accounts, how sudo grants admin rights, and how to spot dangerous account and sudo configurations.
See what is running, control services with systemd, and check the places attackers use to survive a reboot.
Keep Linux systems patched with apt and dnf, enable automatic security updates, and know when a reboot is required.
Inspect interfaces, routes, DNS and open ports, and trace unexpected connections back to the process that owns them.
Find the evidence: read system and authentication logs, filter them fast, and spot brute-force attempts.
Replace passwords with keys, disable root login and lock down sshd — without locking yourself out.
Build a deny-by-default host firewall with ufw or nftables and verify it — without cutting off your own SSH access.
Write safe Bash scripts and build a daily security health-check report you can schedule with cron.
Bring everything together: take a new Linux server from default install to hardened, verified and documented.
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